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Diagnostic application of highly ionized iron lines in the XUV spectrum of a solar flare

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Abstract

Recent atomic data have been used to analyze a solar flare spectrum obtained with the Goddard Space Flight Center's grating spectrometer on the OSO-5 satellite. There exist in the wavelength region 90–200 Å strong lines from each of the ions Fe xviii-Fe xxiv. The Fe xxi lines can be used as an electron density diagnostic for the 107 K plasma. From our analysis of a particular flare, we find a steep positive slope in the emission measure between 106.5 and 107.2 K and an electron density of ∼4 × 1011 cm−3 at 107 K. We emphasise the need for high spectral and spatial resolution observations of solar flares in this wavelength region, which has to date been largely neglected.

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Authors and Affiliations

  1. Department of Applied Mathematics and Theoretical Physics, Silver Street, CB3 9EW, Cambridge, Great Britain

    H. E. Mason

  2. NASA/Goddard Space Flight Center, 20771, Greenbelt, MD, U.S.A.

    A. K. Bhatia, W. M. Neupert & M. Swartz

  3. Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada

    S. O. Kastner

Authors
  1. H. E. Mason
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  2. A. K. Bhatia
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  3. S. O. Kastner
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  4. W. M. Neupert
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  5. M. Swartz
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Mason, H.E., Bhatia, A.K., Kastner, S.O. et al. Diagnostic application of highly ionized iron lines in the XUV spectrum of a solar flare. Sol Phys 92, 199–216 (1984). https://doi.org/10.1007/BF00157246

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  • DOI: https://doi.org/10.1007/BF00157246

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